Current peak for a performer (5)
I believe the answer is:
actor
'for a performer' is the definition.
(actor is a kind of performer)
'current peak' is the wordplay.
'current' becomes 'ac' (alternating current).
'peak' becomes 'tor' (a tor is a rocky peak).
'ac'+'tor'='ACTOR'
(Other definitions for actor that I've seen before include "Cruise, e.g." , "I pretend" , "Films/stage worker" , "Luvvy" , "one to take on roles" .)